PHP INI settings would not be passed to child processes while "processIsolation" is on.

[snakevil]

I configured PHPUnit default settings as

<?xml version="1.0" encoding="UTF-8"?>
<!-- vi:se ft=xml fenc=utf-8 ff=unix tw=80 ai si sw=2 et ts=2 sts=2: -->
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="http://phpunit.de/phpunit.xsd"
         cacheTokens="true"
         processIsolation="true"
         stopOnError="true"
         stopOnFailure="true"
         stopOnSkipped="true"
         strict="true"
>
  <php>
    <ini name="display_errors" value="off"/>
    <ini name="xdebug.collect_includes" value="off"/>
    <ini name="xdebug.collect_params" value="0"/>
    <ini name="xdebug.collect_return" value="off"/>
    <ini name="xdebug.collect_vars" value="off"/>
    <ini name="xdebug.collect_assignments" value="off"/>
    <ini name="xdebug.show_exception_trace" value="off"/>
  </php>
</phpunit>

But when I encounter a test class with lots of @expectedException, it ALWAYS fails with exit code 2.

At last, I removed xdebug.show_exception_trace from php.ini, everything goes well...